EP 1991033 A2 20081112 - Program start ballast
Title (en)
Program start ballast
Title (de)
Vorschaltgerät mit Programmstart
Title (fr)
Ballast d'allumage programmé
Publication
Application
Priority
US 74755807 A 20070511
Abstract (en)
A ballast (10) for powering at least one gas discharge lamp (70) in a program start mode comprises an inverter (200), a resonant output circuit (400), and a control circuit (600). During operation of ballast (10), control circuit (600) monitors a voltage within resonant output circuit (400). When the monitored voltage reaches a first specified level that is indicative of sufficient filament preheating, control circuit (600) maintains the inverter operating frequency at a first present value for a preheating period so as to provide preheating of lamp filaments (72,74). Following completion of the preheating period, control circuit (600) allows the inverter operating frequency to decrease. When the monitored voltage reaches a second specified level that is indicative of sufficient ignition voltage, control circuit (600) maintains the inverter operating frequency at a second present value for an ignition period so as to provide ignition of lamp (70).
IPC 8 full level
H05B 41/04 (2006.01); H05B 41/295 (2006.01)
CPC (source: EP KR US)
H05B 41/14 (2013.01 - KR); H05B 41/24 (2013.01 - KR); H05B 41/295 (2013.01 - EP US); Y10S 315/05 (2013.01 - EP US); Y10S 315/07 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
EP 1991033 A2 20081112; EP 1991033 A3 20140611; CA 2622855 A1 20081111; JP 2008282811 A 20081120; JP 5478839 B2 20140423; KR 101548520 B1 20150901; KR 20080100138 A 20081114; US 2008278085 A1 20081113; US 7459867 B1 20081202
DOCDB simple family (application)
EP 08155755 A 20080507; CA 2622855 A 20080226; JP 2008125104 A 20080512; KR 20080043241 A 20080509; US 74755807 A 20070511